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Inhibition of hydrogen embrittlement of Ni–Ti superelastic alloy in acid fluoride solution by hydrogen peroxide addition
Author(s) -
Yokoyama Ken'ichi,
Yazaki Yushin,
Sakai Jun'ichi
Publication year - 2011
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.33124
Subject(s) - materials science , hydrogen embrittlement , alloy , hydrogen peroxide , fluoride , cathodic protection , hydrogen , corrosion , hydrogen fluoride , embrittlement , inorganic chemistry , metallurgy , nuclear chemistry , electrochemistry , electrode , organic chemistry , chemistry
Inhibition of the hydrogen embrittlement of Ni–Ti superelastic alloy in an acidulated phosphate fluoride (APF) solution has been attempted by adding various amounts of H 2 O 2 . In a 0.2% APF solution, hydrogen absorption is markedly inhibited by adding H 2 O 2 , although corrosion is slightly enhanced by increasing the amount of added H 2 O 2 . By adding a small amount of H 2 O 2 (0.001 M ), in the early stage of immersion, hydrogen embrittlement is inhibited and corrosion is only slightly enhanced. Upon adding H 2 O 2 , it appears that the dominant cathodic reactions change from hydrogen evolution to H 2 O 2 reduction reactions, or the surface conditions of the alloy are changed by H 2 O 2 with a high oxidation capability, thereby inhibiting hydrogen absorption. The present study clearly indicates that infinitesimal addition of H 2 O 2 into acid fluoride solutions is effective for the inhibition of the hydrogen embrittlement of the alloy. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2011.